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View Diary: This week in the War on Workers: Long overdue workplace safety rule draws fierce industry opposition (16 comments)

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  •  .250 mg/cubic meter? Theatrical Smoke Is 10 mg (1+ / 0-)
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    hmi

    http://tsp.plasa.org/...

    You'd need some big industrial machinery  churning huge  quantities of silica to keep that much grit suspended in the air

    Men are so necessarily mad, that not to be mad would amount to another form of madness. -Pascal

    by bernardpliers on Sat Sep 07, 2013 at 11:45:28 AM PDT

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